Joseph Newman Mantiply Bio
Joseph Newman Mantiply is an American professional baseball pitcher who is currently a free agent. He has played in Major League Baseball (MLB) for the Detroit Tigers, New York Yankees, Arizona Diamondbacks, and most recently the Toronto Blue Jays. Mantiply was selected by the Tigers in the 27th round of the 2013 MLB draft and made his MLB debut with Detroit in September 2016. He earned his first All-Star selection in 2022 while pitching for the Arizona Diamondbacks. Throughout his career, Mantiply has established himself as a reliable left-handed reliever, compiling a career win-loss record of 12-13 with a 4.35 earned run average and 210 strikeouts across his MLB appearances.
Early Life and Background
Mantiply attended Tunstall High School in Dry Fork, Virginia, where he developed his skills as a baseball player. His talent on the mound attracted attention from Major League Baseball scouts, and the New York Mets selected him in the 48th round of the 2009 MLB draft. Rather than signing with the Mets, Mantiply chose to pursue higher education and continue his baseball development at the collegiate level.
Mantiply enrolled at Virginia Tech, where he played college baseball for the Virginia Tech Hokies from 2010 to 2013. During his collegiate career, he also spent his summers playing in prestigious wooden-bat leagues to refine his craft. In 2010, he played for the Bethesda Big Train of the Cal Ripken Collegiate Baseball League, and in 2011, he joined the Harwich Mariners of the Cape Cod Baseball League, one of the most respected summer collegiate baseball circuits in the United States.
After his junior season at Virginia Tech, Mantiply entered the 2012 MLB draft, where the Philadelphia Phillies selected him in the 28th round. He again elected not to sign and returned to Virginia Tech for his senior season, continuing his development as a pitcher.
Path to Professional Baseball
Following his senior season at Virginia Tech, Mantiply’s perseverance paid off when the Detroit Tigers selected him in the 27th round (816th overall) of the 2013 MLB draft. This opportunity marked the beginning of his professional baseball career, though he would need to work his way through the minor leagues before reaching the majors.
Mantiply made his professional debut that same season with the Connecticut Tigers, a Short-Season Class A affiliate. Initially, he began his career as a starting pitcher, but he made a significant adjustment in 2014 when he transitioned to the bullpen. This role change would define the rest of his professional career and eventually lead him to MLB success as a relief specialist.
In 2014, Mantiply started the season with the West Michigan Whitecaps, a Class A Advanced affiliate of the Tigers organization, before earning a promotion to the Double-A Erie SeaWolves. The transition to relief pitching allowed him to showcase his stuff in shorter, high-leverage appearances, and his performance in the minors continued to improve as he gained experience in his new role.
Joseph Newman Mantiply Career
Detroit Tigers (2016)
Mantiply’s hard work in the minor leagues culminated when the Detroit Tigers called him up to the major leagues. He made his MLB debut on September 3, 2016, taking the mound for the Tigers in a game that marked the realization of his lifelong dream of reaching professional baseball’s highest level.
On November 8, 2016, shortly after his debut season with Detroit, Mantiply was claimed off waivers by the New York Yankees, joining the storied franchise’s organization. However, his time with the Yankees was short-lived that offseason, as he was released on November 28 before signing a new minor league contract with the team on November 30.
Cincinnati Reds and New York Yankees (2017–2019)
Mantiply spent the 2017 season with the Triple-A Scranton/Wilkes-Barre RailRiders, the Yankees’ top minor league affiliate. He made 35 appearances that season, registering a 6-5 record with a 2.83 earned run average and 62 strikeouts across 70 innings pitched. Following the season, he elected free agency on November 6, 2017.
On November 13, 2017, Mantiply signed a minor league contract with the Cincinnati Reds organization. However, his 2018 season was derailed when he underwent Tommy John surgery on March 9, 2018, ruling him out for the entire season. He re-signed with the Reds on October 11, 2018, on another minor league contract and began working his way back from the major surgery.
Mantiply started the 2019 season with the Triple-A Louisville Bats, recording a 3.72 ERA with 26 strikeouts and one save in 18 games. He also made one appearance for the Double-A Chattanooga Lookouts. On August 9, 2019, Mantiply was traded back to the New York Yankees in exchange for cash considerations, providing him with another opportunity at the major league level.
New York Yankees Second Stint (2019)
On August 11, 2019, the Yankees selected Mantiply’s contract, adding him to their active roster. He made his season debut on August 12 against the Baltimore Orioles and earned his first major league win after relieving Chad Green for three innings. This victory represented a significant milestone in his career, validating his journey through the minor leagues and recovery from Tommy John surgery. However, his stint with the Yankees was brief, as he was designated for assignment on August 13 and elected free agency following the season on November 4, 2019.
Arizona Diamondbacks (2020–2025)
Mantiply signed a minor league contract with the Arizona Diamondbacks organization on January 20, 2020. He began the season in the minor leagues before the Diamondbacks selected his contract to the active roster on September 1, 2020. He made four appearances for Arizona down the stretch, though he struggled with a 15.43 ERA and two strikeouts in 2.1 innings pitched. The Diamondbacks designated him for assignment on September 28, but he cleared waivers and was sent outright to the Triple-A Reno Aces on October 1. He re-signed with Arizona on a minor league contract on November 2, 2020.
On May 15, 2021, the Diamondbacks selected Mantiply’s contract, adding him to their active roster for the remainder of the season. He made 57 relief appearances for Arizona, registering a 0-3 record with a 3.40 earned run average and 38 strikeouts across 39.2 innings pitched. His consistency and reliability in the bullpen earned him a more prominent role in the seasons that followed.
In 2022, Mantiply experienced the pinnacle of his career when he was named to the National League All-Star team as a relief pitcher. This first All-Star selection recognized his outstanding performance throughout the first half of the season. In 69 total appearances for the Diamondbacks that year, he compiled a 2-5 record with a 2.85 earned run average, 61 strikeouts, and two saves over 60 innings of work. His All-Star selection cemented his place as a key component of Arizona’s bullpen.
Mantiply continued his solid performance in 2023, making 35 appearances (including three starts) for the Diamondbacks. He posted a 2-2 record with a 4.62 earned run average and 28 strikeouts over 39 innings of work. In 2024, he appeared in 75 games for Arizona, pitching primarily out of the bullpen, and compiled a 6-2 record with a 3.92 earned run average, 53 strikeouts, and one save across 59.2 innings pitched. His ability to log high appearances and maintain a sub-4.00 ERA demonstrated his durability and effectiveness as a major league reliever.
Toronto Blue Jays (2025–2026)
On July 13, 2025, Mantiply signed a minor league contract with the Toronto Blue Jays, joining the Canadian franchise’s organization. He made 14 appearances for the Triple-A Buffalo Bisons, logging a 2-1 record with a 3.45 earned run average and 19 strikeouts across 15.2 innings pitched. Following the season, he elected free agency on November 6, 2025.
On March 3, 2026, Mantiply re-signed with the Blue Jays on a new minor league contract. On April 5, 2026, Toronto selected his contract, adding him to their active roster. On May 28, 2026, it was announced that Mantiply would require arthroscopic surgery to repair a left knee injury, placing him on the injured list.
Driving Style and Strengths
Mantiply has established himself as a durable and reliable left-handed relief specialist throughout his MLB career. His ability to log high appearance totals while maintaining an ERA consistently below 4.00 demonstrates his effectiveness as a bullpen arm. He has shown the capacity to work multiple innings when needed and has recorded saves in critical situations. His experience spanning multiple organizations has allowed him to adapt to different clubhouse environments and pitching philosophies.
Notable Events and Milestones
The highlight of Mantiply’s career came in 2022 when he earned his first All-Star selection with the Arizona Diamondbacks. This recognition marked a significant achievement for the Virginia Tech product, who had overcome Tommy John surgery in 2018 and multiple minor league stints before establishing himself as a dependable MLB reliever. His first major league win on August 12, 2019, against the Baltimore Orioles while pitching three innings of relief also stands as a meaningful milestone in his professional journey.
Joseph Newman Mantiply Career Wins
Throughout his MLB career, Mantiply has compiled a record of 12-13 with a 4.35 earned run average and 210 strikeouts across his appearances. His career has been defined by consistency and durability, particularly during his tenure with the Arizona Diamondbacks where he logged his highest appearance totals and earned his All-Star selection.
Arizona Diamondbacks Highlights
Mantiply’s most productive years came during his time with the Diamondbacks from 2020 to 2025. During his All-Star season in 2022, he appeared in 69 games and recorded a 2.85 earned run average while notching two saves. His best statistical season came in 2024 when he posted a 6-2 record with a 3.92 earned run average in 75 appearances. He accumulated six saves across his Diamondbacks career while establishing himself as a key left-handed option in Arizona’s bullpen.
Other MLB Appearances
Beyond his Diamondbacks tenure, Mantiply made brief appearances with the Detroit Tigers in 2016, the New York Yankees in 2017 and 2019, and most recently the Toronto Blue Jays in 2026. His first MLB win came during his second stint with the Yankees in August 2019. Combined with his Triple-A statistics and international experience, Mantiply has accumulated well over 300 professional appearances across his career spanning multiple organizations and levels of competition.
| Series | Wins | Losses | ERA | Strikeouts |
|---|---|---|---|---|
| MLB (Career) | 12 | 13 | 4.35 | 210 |
| Arizona Diamondbacks | 10 | 11 | 3.50 | 180 |
2025 Season Performance
The 2025 season marked a transitional year for Mantiply as he navigated his third different organization in four seasons. He began the year with the Arizona Diamondbacks but struggled through his first 10 appearances, posting an 0-1 record with a 15.83 earned run average and eight strikeouts in 9.2 innings pitched. The Diamondbacks designated him for assignment on May 30, 2025, following the promotion of Jeff Brigham, and he was released on June 1, 2025.
Following his release from Arizona, Mantiply signed with the Toronto Blue Jays organization on July 13, 2025. He reported to the Triple-A Buffalo Bisons and found renewed success, logging a 2-1 record with a 3.45 earned run average and 19 strikeouts in 15.2 innings pitched across 14 appearances. His performance in the minors earned him consideration for a return to the majors.
Mantiply’s ability to rebound after being designated for assignment demonstrated his resilience and determination. His experience as a left-handed reliever with All-Star credentials continued to make him an attractive option for major league organizations seeking bullpen depth. The 2025 season ultimately concluded with Mantiply electing free agency in November, setting the stage for his reunion with the Blue Jays in March 2026 and his eventual return to the major leagues.